HART'LIB, Samuel (c.1600-c.l670). An English social reformer. He was born at Elbing, West Prussia, of Polish ancestry, and went to London in 1628. He is said to have introduced the earlier writings of Comenius into England (1637 and 1639), and to have taken an active part in the movement for the unification of the various Protestant sects. He was an intimate friend of Milton, and is said to have been very charitable. His publications, which are devoted chiefly to educational and economic reforms, include: Considerations Tending to the HappyAccomplishment of England's Reformation inChurch and State (submitted to Parliament in 1647); Macaria (1641), containing the outlines of an ideal State; and The Reformed Husbandman (1651).